General Instructions
Description and main characteristics
8
cpg.1
Fully SF6 gas insulated single and double busbar GIS switchgears up to 36 kV in accordance
with IEC Standards
IG-137-EN version 03; 23/06/2016
For testing the gas pressure in each compartment, a
temperature-compensated pressure switch is installed,
with a volt-free contact, for possible use as a remote alarm
or blocking/trip for the functional unit.
Top busbar
This is used for connecting cubicles. It has solid and
shielded insulation, earthed by means of the compartment's
specific earthing bar.
As an option, the busbar is able to segregate the phases
by means of a set of earthed metal plates (metal-clad).
Toroidal current transformers and/or plug-in voltage
transformers can be installed in this compartment, thus
avoiding the need for metering cubicles.
Cable compartment
Figure 1.3
Phase segregation in the cable compartment
(optional)
Located in the bottom part of the cubicle, this has a cover,
interlocked with the earthing circuit, which allows front
access to the medium voltage cables.
In the most complete case, the base can house the
following components:
• Phase segregation consisting of the main box
and the segregating cover.
• Up to 4 screw-in shielded terminals per phase,
as well as space for the corresponding incoming
power cables.
• Clamp flanges for the medium voltage cables.
• Earthing plates.
• Toroidal current transformers.
• Plug-in voltage transformers.
• Surge arresters.
All the elements making up the enclosure are earthed by
means of a conductor consisting of a copper bar capable
of withstanding the rated short-time current. It is located
in the base in such a way that it does not need to be
dismantled in order to insert or remove a cable and its
corresponding termination.
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